Sand-blast apparatus



G. C. FATSC'HER SAND BLAST APPARATUS April 13 1926. Y 1,581,045

Filed March 19, 1924 2 Sheets-Sheet 1 INVENTOR GEoRGE C. F74 TSCHER ATTORNEYS April 13 1926.

G. C. FATSCHER SAND BLAST APPARATUS 2. Sheets-Sheet 2 Filed March 19, 1924 g ATTORNEYS Patented A1313 13,1926.

A-rE ro Fi E. L

UNITED STATES- ,enonon c. mas or riAvEn, connnorronir, Asses-sole 'ro linnitiitt saver g sAnnnLAs'r COMPANY, or New HAVEN, menswear, neonronarron deceit-1" Nnc'rIo'UT. a

Application flledMareh 19, 1924. Serial No. 700,279.

To all whom it may concern:

Be it known that I, Gnoncn G. Fn'rsoninu.

a citizen of the United States of America;

residing at New Haven, in the county. New Haven and State of'Connecticut, have invented certain new and usefiil Improve inents in Sand-Blast Apparatugof which the following is a specification.) I

My invention relates to sand blast apparatus and particularly to apparatus of the rotary blast barrel type. The object of my invention is to increase the efliciency and to facilitate the use of the barrel by improvements in various particulars which will-be hereinafter stated, orshown in the accompanying drawings in which Fig. l is a broken end elevation of zit-sand blastbarrel in which my improvements areembodied in one form; i

Fig; 2 is a longitudinal section through; l 1

Fig. 3 is a broken partial end-elevation of the barrel viewed from the end opposite that shown in, Fig. 1; and

Fig. t is a partial"longitudinal section" through the door end of the barrel, showing the door latched in openposition. I

The present construction has a generalresemblance to thatshown in copending ap plication Ser. No. 627,679, filed March 26; 1923. As in thatconstri'iction, the barrel comprisesa perforated frusto-conical body 153 closed at its end of less diameter by the rotary head 16, and at its opposite end by the rotary head 17 which is apertured and carries the semi-circular door 18; Surrounding the barrel body, but spaced there: from, is the imperforate' cylindricalshell 19. The sand which. passes through the perforations 20' in the barrel body to the shell, is deflected by theintermediate scrollQl' to lifting scoops 22 arranged between the rotary head 16 and a parallel annular flange 23, spaced from the head 16 by the integral bearing ring 24, from which the scoops project. The bearing ring rests on a pair of supporting rollers 25,and the head 17 at the opposite end of the barrel, is. also provided with a bearingjring 26 which rests upon the pair of rollers 27. Bothpairs of rollers and 27 aredriventh'rough gearing 28 to bodily rotate thebarrel, shell,- heads, scroll and scoops. Y r

The blast mechanismand associatedele ments are supported stationary position bythe .standard 29 rising from one end o'f the bed frame .30. Located in the upper portion-of the sand recovery chamber is a stationary hopper 31, to which the 2 discharge the sand-lifted thereby during the rotation of the barrel. Inasmuch as fragments of metal cleaned from the cast-,-

ings by the blast are lifted withthe sand by the scoops for delivery to the hopper, but are undesirable since they are often of suiiicient' size toQchoke its outlet, or if theyqpass thelatterare apt to foul the nozzles, I provide a screen 32 to. prevent.

their entry into thehopper: This screen is of arcualte form with sideand end flangesforined by an auxiliary frame 33, and is readily mounted and withdrawn fromposie tioirbyineans of the handle 34; ll support for the inner end of the Screen is afforded by an arcuate flange 35-secured to: the wall of the, hopper. A. face plate 3.6 for the screen overlaps the annularflange 23 ofthe head 16 and forms therewith seal "which prevents air and dust leakage at this point during the operation of the barreL- 7 In the bottom of-the hopper-3L are. ports 37 which register with funnel-shaped months 88) ,ofpassalges in body 39 lea ding. to the mixing chamber d0 and the blast nozzles 41. Slide valves l2control the ports 38. It is highly desirablethat some means be afforded to ascertain-What the nozzles are, receiving. a proper feed of sand in order toenable then'i to function; properly. For this purpose,the lower end of the hopper is spaced from the nozzle body 39, and aperture 43 is opened in the plate 44 in} such location that the flow of sand tothe'; nozzles from the hopper may he -readilyobserved. and regulated by-the attendant by means of the slide Valves 42. i

The nozzles 41 require frequentrenew'ah To facilitate this nozzle body 39 is! mounted upon an n'gle iron 45 which is detachably securedto the standard 29' by any suitable means,- suchas looking pins46. The closure plate ll may also be supportedon the angle iron and removed therewith, thu s -leav.- ing ample space-for inspection of thesand recovery chamber.

The nozzles 41 pass through a 'stationary guard 47 detachably supported-by bolts 48 at the central aperture 49 in the-rotary head 16L WVhile'the guard 47 issuffioiently supported by the nozzles J llwhile; the latter i i o 1,531,045

are in position,- asupport' of some sort is necessary if the guard 47 be not removable with the nozzles. Since the guard 47 is not subject to great wear and needs only occasional replacement, it is preferable to make it independent of the nozzles so; that the latter can bewithdrawn without disturb-ing the guard. r

Opening through the lower portion of the stationary closure plate 50, carried by the standard 29, is an exhaust pipe51 through which'the barrel is ventilated. In order to prevent sand from being carried into the exhaust pipe, a'V-shaped shed 52 issecured .tothestationaryhead 50 'above the intake of the exhaust pipe; Such sand as escapes the'hopper or nozzle feed is thus deflected to'thescoops 22,Which again lift it to the h pper 31--= V 1 The door 18, through'which the barrel is r 7 charged anddischargedfis held open, du-rv ing the rotation of the barrel for discharge,

by means of a locking pin 53,the, end of which is insertable through a hole in the bracket angle Men the door. 1 This-bracket registers, :when'the-door is 0pm, with the bracket angle 55 on the -head'17 bywhich the lockingpin 53 is carried.- A-set screw 56 beneath the locking lugs 60 on the ring 26."

In order to maintain the latches in looking position, -I*-provide wing-headed clamping;

screws 6l which pass through the latches,

bear against the bosses on whichthe latter:

are pivoted," and force the engaged ends of thelatches into clamping engagement with the latch lugs on theringg. An arrangement of" this character insures a door closure tight against the escape of sand and dust.

" Secured to the inner face of the barrel are tumbling ribs 62 extendinglongitudinally of the barrel but in directions transverse toj the longitudinalaxis of the barrel. These ribs 62' are so shaped and'located with rei: eren'ce tothe direction of rotation that during rotation of the'barrel the e'ndsof the ribs adj'acentthe door end of the barrel prece'de'the ends thereof adjacent theblast end of the barrel, -These ribs function to return'tow'ard the blast bend of thelbarrel andintothe zone of the direct blast, the,

castings or other objects in the barrel which,

Moreover, the ribs serve to'tumble the castin'gs' not only on axes extending longitudinally of the barrel, but also to somersault them on axes at an angle to the longitudinal axis ofthe barrel. The castingsi are thus not only brought into the zone-of-- the most efii-i cient action of the blast, but are also exposed on all surfaces to the latterduring the operation of the barrel.

.While the present invention is directed to details of improvement,it will be obvious that the betterments maybe attained by various other specific embodiments than those shown. With the understandingtherefore that my invention is not limited to exact details, I claimv v V 1. A rotary sandblast barrel having at one end a rotary head comprising a' substantially semi-circular'door pivoted to and forming portion of said head, together with latch; lugsfon the respective head members, saidlugslying substantially in register when the door isin f-ully open position, and a latch bar carried byqone'of said head members and slidable through said latch lugs to hold the door. against closure during the rotation ofthe barrel;

2.; A rotary sand blast barrel, comprising abarrel body of frusto-conicalshape, means for'rotatingthe. same on a substantially horizontal axis, blast mechanism arranged at the barrel end of less diameter and adapted to play upon articles placed within the barrel, incombination withribs on, the inner face of the barrel shaped to engage said articles and to displace, the same from the barrel end of greater diameter toward the barrel 'end' of less diameter during the rota tionof the barrel.

3. A rotary sand blast barrel, comprising a barrel body of frusto-conical shape, means for rotating. the same on a substantially horizontal axis; blast mechanism arranged at the barrel end of less diameter and adapted to play upon articles placed within the barrel, in combination with, ribs onjthle,

inner face of the barrel shaped to engage and somersault said articles lengthwise of the barrel. 7, I

4. A rotary sand blast barrel-having at one end lifting scoops, meansfor delivering 'tosaid scoops the sand used in the barrel, a hopper to which said scoops discharge, a casing enclosing said scoop and hopper, and a removable screen overlying the hopper and through which. the sand from the scoops is discharged to the hopper. V i

5. A rotary, sand blast barrel having at one end an endless seriesof lifting scoops, means fordelivering to said scoops the sand used in the barrel, a hopper arranged adjacent but beneath the arcuate upper travel of the scoops, and towhich the latter discharge. during said travel, a casing enclosing said scoops and hopper, and a removable arcuate screen overlying the hopper and through which the sand from the scoops is discharged to thehopper. I

In testimony whereofv I have signed my name to this specification. V

j GEORGE o. FATSCHER. 

